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Reports <code>synchronized</code> blocks that lock on an object initialized with a literal.
<p>
  String literals are interned and <code>Character</code>, <code>Boolean</code> and <code>Number</code> literals can be allocated from a cache.
  Because of this, it is possible that some other part of the system, which uses an object initialized with the same literal, is actually
  holding a reference to the exact same object. This can create unexpected dead-lock situations, if the lock object was thought to be private.
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<p><b>Example:</b></p>
<pre><code>
  class Main {
    final String mutex = "Mutex";
    void method() {
      synchronized (mutex) {
      }
    }
  }
</code></pre>
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<p>
  Use the <strong>Warn on all possible literals</strong> option to report any synchronization on
  <code>String</code>, <code>Character</code>, <code>Boolean</code> and <code>Number</code> objects.
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